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Date: Tue, 4 Jan 2022 10:20:48 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jiri Olsa <jolsa@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>
Subject: [PATCHSET 0/6] perf lock: Random updates for the locking analysis (v1)
Hello,
I have some updates in the perf lock command (focused on 'report').
The main change is to add -c (or --combine-locks) option to aggregate
results based on lock class name.
Without this option, the result deals with lock addresses so instances
in the same lock class will have separate entries like below:
# perf lock report
Name acquired contended avg wait (ns) total wait (ns) max wait (ns) min wait (ns)
rcu_read_lock 251225 0 0 0 0 0
&(ei->i_block_re... 8731 0 0 0 0 0
&sb->s_type->i_l... 8731 0 0 0 0 0
hrtimer_bases.lo... 5261 0 0 0 0 0
hrtimer_bases.lo... 2626 0 0 0 0 0
hrtimer_bases.lo... 1953 0 0 0 0 0
hrtimer_bases.lo... 1382 0 0 0 0 0
cpu_hotplug_lock... 1350 0 0 0 0 0
hrtimer_bases.lo... 1273 0 0 0 0 0
hrtimer_bases.lo... 1269 0 0 0 0 0
hrtimer_bases.lo... 1198 0 0 0 0 0
hrtimer_bases.lo... 1116 0 0 0 0 0
&base->lock 1109 0 0 0 0 0
hrtimer_bases.lo... 1067 0 0 0 0 0
hrtimer_bases.lo... 1052 0 0 0 0 0
hrtimer_bases.lo... 957 0 0 0 0 0
hrtimer_bases.lo... 948 0 0 0 0 0
css_set_lock 791 0 0 0 0 0
hrtimer_bases.lo... 752 0 0 0 0 0
&lruvec->lru_loc... 747 5 11254 56272 18317 1412
hrtimer_bases.lo... 738 0 0 0 0 0
&newf->file_lock... 706 15 1025 15388 2279 618
hrtimer_bases.lo... 702 0 0 0 0 0
hrtimer_bases.lo... 694 0 0 0 0 0
...
With -c option, the hrtimer_bases.lock would be combined into a single
entry. Also note that the lock names are correctly displayed now.
# perf lock report -c
Name acquired contended avg wait (ns) total wait (ns) max wait (ns) min wait (ns)
rcu_read_lock 251225 0 0 0 0 0
hrtimer_bases.lock 39449 0 0 0 0 0
&sb->s_type->i_l... 10301 1 662 662 662 662
ptlock_ptr(page) 10173 2 701 1402 760 642
&(ei->i_block_re... 8732 0 0 0 0 0
&base->lock 6705 0 0 0 0 0
&p->pi_lock 5549 0 0 0 0 0
&dentry->d_lockr... 5010 4 1274 5097 1844 789
&ep->lock 2750 0 0 0 0 0
&(__futex_data.q... 2331 0 0 0 0 0
(null) 1878 0 0 0 0 0
cpu_hotplug_lock 1350 0 0 0 0 0
&____s->seqcount 1349 0 0 0 0 0
&newf->file_lock 1001 15 1025 15388 2279 618
...
Maybe we can make it default later (with a config and --no-combine-locks).
You can get it from 'perf/lock-combine-v1' branch at
git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
Thanks,
Namhyung
Namhyung Kim (6):
perf lock: Convert lockhash_table to use hlist
perf lock: Change type of lock_stat->addr to u64
perf lock: Sort map info based on class name
perf lock: Fix lock name length check for printing
perf lock: Add -c/--combine-locks option
perf lock: Carefully combine lock stats for discarded entries
tools/perf/Documentation/perf-lock.txt | 4 +
tools/perf/builtin-lock.c | 155 +++++++++++++++++++------
2 files changed, 124 insertions(+), 35 deletions(-)
base-commit: b9f6fbb3b2c29736970ae9fcc0e82b0bd459442b
--
2.34.1.448.ga2b2bfdf31-goog
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